When your reader is connected via USB, you should be able to see it as a drive letter in windows? (I have a kindle not a sony, but assume they will act the same.) So from "My Computer" or "Windows Explorer" or whatever, just browse to the drive letter assigned to your sony and look for the media.xml file. So if your Sony is assigned as drive letter e, look in e:\database\cache for media.xml and delete.
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